Windows 8.1 and Xbox arrived. Ballmer's leaving, but he bought part of Nokia first. Just another year in the life of a company struggling to stay relevant.

They say you don't move forward by standing still. In a frenzied grasp for relevance in the mobile age, Microsoft spent 2013 shaking things up at a cellular level.

Beyond major new releases for the Xbox, Windows, and Office brands this year, Microsoft spent billions to gobble up Nokia, revamped itself from head to toe as a device and services company, and said a bittersweet sayonara to its longtime chieftain—and those are just the major headlines.

With so much shakin' going on, it's hard to call any individual element a "hit" or a "miss," especially since several of Microsoft's moves contain elements of both. But hey, it's time to reflect, so let's give it a shot!

Let's start on a high note. Microsoft released Office 365 Home Premium, its ambitious "Office as a service" offering, way back in January, then extended its reach to Android and Apple phones later in the year.

While the mere existence of Office 365 Home Premium rekindled the old "software vs. services" furor, there's no debating that uptake has been brisk: In late October, Microsoft announced that more than 2 million users were paying $10 per month (or $100 per year) for 20GB of SkyDrive cloud storage, instantaneous updates, and—most important—the right to use Office 2013 on up to five devices. Not too shabby.

Say what you want about Windows RT, and how it's holding back Microsoft's otherwise attractive Surface tablets. (I have!) Rant, if you will, about how the Surface's relatively high pricing dulls its luster in the eyes of consumers. (You might want to point out how the original Surface RT's usage skyrocketed when its price was dropped to $350.)

It's too early to call one of Microsoft's biggest moves in 2013 a hit or a miss: Nokia.

Microsoft spent a piggybank-pummeling $7.17 billion to acquire the company's phone and tablet business in September, with the deal expected to close early next year. Theoretically, the deal could give Microsoft's fledgling devices division a big boost in expertise and established sales channels, and give the company a more Apple-esque grip over the Windows Phone ecosystem. Nokia sells a whopping 90-plus percent of all Windows Phones.

Then again, Windows Phone sales are slack, and Nokia was said to be faltering before Microsoft's deus ex machina. Only time will tell whether the union succeeds or fails.

But here's the thing: At its core, Windows 8.1 is still Windows 8, just a far more refined version of it, and the Live-Tile ideal hasn't proved as compelling as Microsoft would have hoped. PC sales are still cratering, and Windows tablets have barely made a dent.

Remember how Microsoft had to stop using the word "Metro" to describe Windows 8's interface after a trademark dispute? The saga continues.

Earlier this year, Microsoft had to walk away from the SkyDrive name after losing a trademark case against British broadcaster British Sky Broadcasting. The cloud-based glue unifying so many of Microsoft's services has to be renamed, and Microsoft had to pay BSkyB an undisclosed sum.

It won't make a big difference in your day-to-day usage of the service, but it's highly embarrassing for Microsoft, which just flushed all those dollars on building the SkyDrive brand.

Nevertheless, some important cornerstones were laid this year. The Windows Store got a killer revamp in Windows 8.1. Overall app growth has remained steady, just slooooooow. More important, most of the major categories have at least basic coverage, and 2013 saw some big-name additions, including Facebook, Twitter, Dropbox, the NFL, and more.

This hit also reeks slightly of a miss. Just as Windows 8 boldly reimagined the PC, the original vision for the Xbox One was an overhaul of everything a console stands for. Digital sharing! Always-on connections! An all-seeing, always-on Kinect! Microsoft's ambitions proved a bit too bold, however, and after some backlash, Microsoft rolled back its most audacious plans.

That didn't cripple the console. The Xbox One still smartly integrates streaming video, live TV, and game-playing into a smooth overall experience that, even at $500, is an outstanding value. (It even plays nice with Windows PCs!)